Asource charge generates an electric field of 1236 n/c at a distance of 4 m. what is the magnitude of the source charge?

Explanation:

A region around a charged particle where another charged particle experiences a force is called electric field.

Electric field strength is defined as the force experienced by unit positive test cahrge when placed in an electric field.

The formula of electric field due to a point cahrge is given by

E = k q / r^2

Where k is a constant and it's value is

9 × 10^9 Nm^2/C^2.

1236 = 9 × 10^9 × q / 16

q = 1.48 × 10^-3 Coulomb

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5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000